Created
September 19, 2013 04:44
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クロージャーを利用してキャッシュすると速いよというテク
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function fibonacci1(x) { | |
if (x < 2) { | |
return 1; | |
} | |
return fibonacci1(x - 1) + fibonacci1(x - 2); | |
} | |
var fibonacci2 = (function() { | |
var cache = {}; | |
function fibonacci(x) { | |
if (x < 2) { | |
return 1; | |
} | |
if (!cache[x]) { | |
cache[x] = fibonacci(x - 1) + fibonacci(x - 2); | |
} | |
return cache[x]; | |
} | |
return fibonacci; | |
})(); | |
console.time('fibonacci1'); | |
fibonacci1(33); | |
console.timeEnd('fibonacci1'); | |
console.time('fibonacci2'); | |
fibonacci2(33); | |
console.timeEnd('fibonacci2'); |
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